Computer - Data & information


What is Data?

Data can be defined as a representation of facts, concepts or instructions in a formalized manner, which should be suitable for communication, interpretation or processing by human or electronic machine.

Data is represented with the help of characters like alphabets (A-Z, a-z), digits (0-9) or special characters(+,-,/,*,<,>,=, etc.).

Computer Data

What is Information?

Information is organised or classified data so that it has some meaningful values to the receiver.

Information is the processed data on which decisions and actions are based.

For the decision to be meaningful, the processed data must qualify the following characteristics:

  • Timely - Information should be available when required.

  • Accuracy - Information should be accurate.

  • Completeness - Information should be complete.

Computer Information

Data Processing Cycle

Data processing is the re-structuring or re-ordering of data by people or machine to increase their usefulness & add values for particular purpose.

Data processing consists of basic steps input, processing and output. These three steps constitute the data processing cycle.

Data Processing Cycle
  • Input - In this step, the input data are prepared in some convenient form for processing. The form will depend on the processing machine. For example, when electronic computers are used, the input data could be recorded on any one of several types of input mediums, such as magnetic disks, tapes and so on.

  • Processing - In this step, input data are changed to produce data in a more useful form. For example, pay-checks may be calculated from the time cards or a summary of sales for the month may be calculated from the sales orders.

  • Output -Here, the results of the proceeding processing step are collected. The particular form of the output data depends on the use of the data. For example, output data may be pay-checks for employees.

Computer Data Processing